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--- projects:ledcube [2011/05/29 14:07]
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-The Cube was not my idea, I stumbled upon a video of a LED cube while researching the [[http://arduino.cc|arduino]]. I found the LED cube so awesome that I decided to make one myself.
-Now it has been build, I can understand why you can't really buy one. If you find a company that produces it, it is ridiculously expansive. And that is because it takes a lot of time just building the thing.
-To give you some idea, I used 512 blue diffused 5mm LED's and 55 meters of silver-plated wire. This equals to hundreds of hours of pure soldering fun :-)
-Here is a video of a first demo of the end product:
-<html>
-<iframe width="425" height="349" src="http://www.youtube.com/embed/CpAhQGDWbUY" frameborder="0" allowfullscreen></iframe>
-</html>
-====== The basics ======
-The basic principle behind this cube is [[http://en.wikipedia.org/wiki/Multiplexing|multiplexing]]. Simply put: all the columns are cunnected (8x8=64 columns) and all levels are connected (8 levels). So you have 64 connections on the bottom and 8 connections for the levels.
-All you have to do to turn one LED on, is to put ~2,5Volt on one column and 0Volt on the corresponding level. For the second LED you do this again, and for the next again ... And so on.
-If you do this a couple of hundred times per second, the human eye does not see it blinking. The human eye thinks the LED's are constantly on. This phenomenon is called [[http://en.wikipedia.org/wiki/Persistence_of_vision|Persistence of vision]] .
-The intelligence be hind it all is an [[http://www.atmel.com/dyn/products/product_card.asp?part_id=4198|Atmega328P]] microprocessor. This sounds like a lot of work but actually you can buy a PCB with a micro-controller, serial port for programming and all basic components for using the Atmega328P quite cheaply. I bought a couple at [[http://www.avmicrotech.com/page1.php|avmicrotech]] on [[http://stores.ebay.com/AVRMEGASHOP|e-bay]]. You need only one board like the ''ATMEL ATMEGA328 Arduino Duemilanove bootloader'' for this project.